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    泰宁地区中志留世辉绿岩脉成因及对陆内造山作用的制约

    陈梦婷 魏俊浩 石文杰 李艳军 刘乃忠

    陈梦婷, 魏俊浩, 石文杰, 李艳军, 刘乃忠, 2020. 泰宁地区中志留世辉绿岩脉成因及对陆内造山作用的制约. 地球科学, 45(3): 892-909. doi: 10.3799/dqkx.2019.022
    引用本文: 陈梦婷, 魏俊浩, 石文杰, 李艳军, 刘乃忠, 2020. 泰宁地区中志留世辉绿岩脉成因及对陆内造山作用的制约. 地球科学, 45(3): 892-909. doi: 10.3799/dqkx.2019.022
    Chen Mengting, Wei Junhao, Shi Wenjie, Li Yanjun, Liu Naizhong, 2020. Origin of Middle Silurian Diabase Dike in the Taining District, South China: Implications for Intracontinental Orogeny. Earth Science, 45(3): 892-909. doi: 10.3799/dqkx.2019.022
    Citation: Chen Mengting, Wei Junhao, Shi Wenjie, Li Yanjun, Liu Naizhong, 2020. Origin of Middle Silurian Diabase Dike in the Taining District, South China: Implications for Intracontinental Orogeny. Earth Science, 45(3): 892-909. doi: 10.3799/dqkx.2019.022

    泰宁地区中志留世辉绿岩脉成因及对陆内造山作用的制约

    doi: 10.3799/dqkx.2019.022
    基金项目: 

    国家自然科学基金项目 41672083

    国家自然科学基金项目 41772071

    中央高校基本科研业务费专项资金 CUGQYZX1708

    详细信息
      作者简介:

      陈梦婷(1992-), 女, 博士研究生, 从事矿物学、岩石学、矿床学研究

    • 中图分类号: P588.124;P597.3

    Origin of Middle Silurian Diabase Dike in the Taining District, South China: Implications for Intracontinental Orogeny

    • 摘要: 华南早古生代造山作用以武夷-云开造山带最为典型.然而,该次造山作用过程中岩石圈地幔性质及构造背景一直存在争议,还需要更多的基性岩证据.对武夷造山带中段泰宁地区何宝山辉绿岩脉开展了年代学、地球化学及Sr-Nd-Hf同位素研究.LA-ICP-MS锆石U-Pb年龄(430±3 Ma)表明辉绿岩脉形成于中志留世.岩石具有高Al2O3(15.23%~18.49%)、低Na2O(2.82%~4.21%)和K2O(1.63%~2.42%)含量特征,属亚碱性系列.稀土元素标准化图呈右倾,无明显Eu异常,显示富集大离子亲石元素(Rb、Ba、K、La、Sr)、不同程度亏损高场强元素(Ta、U、Hf、Ti).岩石具有高Nb含量(5.74×10-6~8.45×10-6),其(Nb/La)N和Nb/U值与富Nb岛弧玄武岩相似.全岩(87Sr/86Sr)i=0.709 5~0.710 9,εNdt)=-0.8~-0.1,锆石εHft)=-9.2~-2.7,对应二阶段模式年龄T2DM(Hf)=1.4~1.8 Ga.地球化学、Sr-Nd及Hf同位素揭示泰宁地区基性岩浆源自富集岩石圈地幔13.3%~21.8%的熔融,但在熔融前曾受到古俯冲物质(俯冲板片熔体+5%沉积物熔体)的源区混染.武夷地区于早古生代为陆内造山环境,脉岩形成于后造山垮塌阶段,可能与冈瓦纳东缘造山作用的应力向大陆传播引起华夏地块内部俯冲有关.

       

    • 图  1  早古生代岩浆岩和变质岩分布(a)及研究区地质简图(b)

      图中年龄均为锆石U-Pb年龄;图a据Yao et al. (2012)修改;图b据陈国建等(2015)修改

      Fig.  1.  Distribution of Early Paleozoic magmatic and metamorphic rocks in Wuyi-Yunkai Orogen Belt (a) and simplified geological map of the study area (b)

      图  2  辉绿岩脉矿物组成(正交偏光)

      Cpx.单斜辉石; Hbl.角闪石; Pl.斜长石; Q.石英; Bt.黑云母; Chl.绿泥石

      Fig.  2.  Mineral assemblage of the Hebaoshan diabase dike under microscope

      图  3  何宝山辉绿岩脉锆石阴极发光图像(a)、U-Pb年龄谐和图(b、c)和t -εHf(t)图解(d)

      图a中实线圆圈表示年龄分析点位和编号, 虚线圆圈表示Hf同位素分析点位和编号;图d据Wang et al. (2013b)

      Fig.  3.  Cathodoluminescence (CL) images of the representative zircon grains (a), concordia diagrams of zircon U-Pb data (b, c) and t vs. εHf(t) diagram (d) for the Hebaoshan diabase dike

      图  4  何宝山辉绿岩脉Zr/TiO2-Nb/Y图解(a)和Nb/U-Nb图解(b)

      图a据Winchester and Floyd (1976);图b据Kepezhinskas et al. (1996)

      Fig.  4.  Zr/TiO2 vs. Nb/Y (a) and Nb/U vs. Nb (b) for the Hebaoshan diabase samples

      图  5  何宝山辉绿岩脉哈克图解

      Fig.  5.  Harker diagrams for the Hebaoshan diabase samples

      图  6  何宝山辉绿岩脉球粒陨石标准化稀土元素配分模式(a)和原始地幔标准化微量元素蛛网图(b)

      标准化值引自Sun and McDonough (1989)Taylor and Mclennan (1985);N-MORB、E-MORB和OIB数据引自Sun and McDonough (1989);武夷带南部志留纪富Nb辉长岩数据引自Wang et al. (2013a);Okinawa Trough弧后盆地玄武岩数据引自Shinjo et al. (1999)

      Fig.  6.  Chondrite-normalized REE pattern (a) and primitive mantle-normalized trace element spider diagram (b) for the Hebaoshan diabase samples

      图  7  何宝山辉绿岩脉87Sr/86Sr-εNd(t) (a), Nb/La-εNd(t) (b), SiO2-εNd(t) (c)图解和Y-Zr/Y图解(d)

      图a、b和c据Wang et al. (2013a).图a中武夷山南部志留纪辉长岩、Reccamonfina、Batu tara和Reman Region均代表来源于俯冲板片流体或熔体交代过的富集岩石圈地幔的钾质岩石(Nelson, 1992).图a和b中①③黑色实线分别代表亏损地幔和地幔楔与华夏地块沉积物源区混合模拟曲线, 其中①表示华南板块基底发生拆沉进入软流圈地幔;②④灰色虚线分别代表幔源和地幔楔来源岩浆发生不同程度地壳混染模拟曲线.图d据Zhao et al. (2007), 为不同类型地幔部分熔融模型(选择原始地幔为初始组成);Ga表示石榴石二辉橄榄岩地幔,Ga-Sp表示石榴石-尖晶石二辉橄榄岩地幔,Sp表示尖晶石二辉橄榄岩地幔,Sp-Pl表示尖晶石-斜长石二辉橄榄岩

      Fig.  7.  Initial Sr-Nd isotopic composition at 430 Ma (a), Nb/La vs. εNd(t) (b), SiO2 vs. εNd(t) (c) and Y vs. Zr/Y (d) for the Hebaoshan diabase samples

      图  8  何宝山辉绿岩脉La/Nb-Ba/Nb图解(a)和La/Nb-La/Ba图解(b)

      图a据Zhang et al. (2012);图b据Zhao et al. (2007). MORB.洋中脊玄武岩;OIB.洋岛玄武岩;PM.原始地幔;HIUM.高U/Pb比值的地幔;IAT.岛弧拉斑玄武岩; DupalOIB.异常洋岛玄武岩

      Fig.  8.  La/Nb vs. Ba/Nb (a) and La/Nb vs. La/Ba (b) for the Hebaoshan diabase samples

      图  9  何宝山辉绿岩脉Nb/Zr-Th/Zr (a)、Th/Yb-Ba/La (b)、εNd(t)-Nd/Pb (c)和εNd(t)-Nb/Y (d)图解

      图c、d据Wang et al. (2013a)

      Fig.  9.  Nb/Zr vs. Th/Zr (a), Th/Yb vs. Ba/La (b), εNd(t) vs. Nd/Pb (c) and εNd(t) vs. Nb/Y (d) for the Hebaoshan diabase samples

      图  10  何宝山辉绿岩脉成因模式

      图a据Charvet et al. (2010)修改, 武夷-云开地区于新元古代被俯冲熔体、5%沉积物熔体混染及少量俯冲流体交代的岩石圈地幔在460~ 435 Ma同造山挤压条件下处于稳定状态;图b据Yao et al.(2012)修改, 435~400 Ma后造山拉张环境中, 岩石圈地幔下部发生拆沉, 上涌的软流圈促使经改造发生富集作用的岩石圈地幔部分熔融, 形成基性岩浆

      Fig.  10.  The petrogenetic mechanism for the Hebaoshan diabase dike

      表  1  泰宁地区何宝山辉绿岩脉锆石U-Pb分析结果

      Table  1.   Zircon LA-ICP-MS U-Pb results for the Hebaoshan diabase dike

      点号 元素含量(10-6 Th/ U U-Th-Pb同位素比值 年龄(Ma)
      232Th 238U 207Pb/ 235U 1σ 206Pb/ 238U 1σ 208Pb/ 232Th 1σ 207Pb/ 206Pb 1σ 207Pb/ 235U 1σ 206Pb/ 238U 1σ
      HCY-1-01 147 635 0.23 0.532 2 0.022 0 0.069 0 0.001 0 0.029 6 0.004 8 428 94.4 433 14.6 430 6.3
      HCY-1-02 124 270 0.46 6.054 2 0.204 0 0.333 6 0.005 0 0.138 3 0.003 9 2 103 59.6 1984 29.4 1 856 24.0
      HCY-1-03 75 104 0.72 0.701 8 0.078 7 0.083 0 0.002 4 0.037 2 0.001 6 665 294.4 540 47.0 514 14.2
      HCY-1-04 67 123 0.54 6.471 1 0.128 6 0.374 7 0.003 9 0.122 5 0.002 5 2 025 36.3 2 042 17.5 2 051 18.5
      HCY-1-05 98 157 0.63 7.279 9 0.232 8 0.373 5 0.008 9 0.132 1 0.009 9 2 258 66.5 2 146 28.6 2 046 41.8
      HCY-1-06 375 803 0.47 0.538 6 0.040 7 0.069 4 0.000 6 0.023 7 0.002 6 557 15.7 449 17.6 430 4.5
      HCY-1-07 425 478 0.89 0.469 3 0.022 2 0.066 2 0.002 5 0.046 5 0.005 7 256 95.4 391 15.3 423 15.2
      HCY-1-08 103 257 0.40 5.316 6 0.100 1 0.336 6 0.003 3 0.102 1 0.001 8 1 866 33.3 1872 16.1 1 870 16.1
      HCY-1-09 133 1 645 0.08 0.555 9 0.022 1 0.068 4 0.002 3 0.021 9 0.002 0 534 32.1 450 8.5 430 5.4
      HCY-1-10 100 91 1.11 7.108 8 0.222 6 0.373 4 0.007 1 0.107 0 0.002 4 2 206 53.9 2 125 27.9 2 045 33.6
      HCY-1-11 263 835 0.31 0.573 7 0.016 0 0.069 2 0.001 3 0.032 8 0.001 7 606 36.1 460 10.4 431 8.0
      HCY-1-12 128 111 1.15 6.666 0 0.190 5 0.374 0 0.007 1 0.112 2 0.003 1 2 085 44.1 2 068 25.3 2 048 33.4
      HCY-1-13 152 206 0.74 5.939 3 0.156 7 0.345 8 0.004 5 0.103 3 0.001 9 2 013 40.7 1 967 23.0 1 915 21.8
      HCY-1-14 108 437 0.25 7.039 8 0.307 8 0.374 4 0.014 2 0.207 7 0.012 2 2 181 54.9 2 116 38.9 2 050 66.8
      HCY-1-15 105 168 0.63 6.689 2 0.154 8 0.374 8 0.006 0 0.109 8 0.002 0 2 087 34.6 2 071 20.5 2 052 28.3
      HCY-1-16 270 1 648 0.16 0.557 1 0.011 3 0.068 9 0.000 6 0.026 1 0.000 9 543 44.4 450 7.3 429 3.5
      HCY-1-17 246 1 748 0.14 0.563 7 0.059 2 0.069 0 0.002 4 0.021 3 0.003 7 567 157.4 454 38.4 430 3.0
      HCY-1-18 128 127 1.01 6.885 9 0.295 1 0.374 9 0.006 0 0.117 5 0.004 2 2 135 86.6 2 097 38.0 2 052 28.3
      HCY-1-19 925 1 600 0.58 0.530 0 0.032 5 0.069 3 0.003 7 0.032 2 0.002 0 479 34.7 441 17.2 430 4.3
      HCY-1-20 734 1 183 0.62 0.512 5 0.044 0 0.069 1 0.003 2 0.022 4 0.000 6 343 91.7 420 29.5 431 5.3
      HCY-1-21 350 487 0.72 6.940 6 0.191 7 0.373 8 0.005 5 0.103 4 0.002 7 2 150 49.7 2 104 24.5 2 047 25.8
      下载: 导出CSV

      表  2  泰宁地区何宝山辉绿岩脉锆石Hf同位素分析结果

      Table  2.   Zircon Lu-Hf isotopic compositions for the Hebaoshan diabase dike

      点号 年龄(Ma) 176Yb/177Hf 1σ 176Lu/177Hf 1σ 176Hf/177Hf 1σ εHf(t) T1DM (Ga) T2DM (Ga) fLu/Hf 对应U-Pb点号
      HCY-1-01 430 0.026 234 0.008 581 0.001 062 0.000 104 0.282 436 0.000 841 -2.7 1.16 1.44 -0.97 01
      HCY-1-02 2 025 0.017 891 0.005 228 0.000 682 0.000 059 0.281 589 0.000 750 2.5 2.31 2.42 -0.98 04
      HCY-1-03 2 258 0.024 787 0.007 072 0.000 934 0.000 079 0.281 492 0.000 734 3.9 2.46 2.54 -0.97 05
      HCY-1-04 430 0.023 840 0.006 639 0.000 782 0.000 064 0.282 437 0.000 715 -2.5 1.15 1.43 -0.98 06
      HCY-1-05 423 0.036 467 0.022 866 0.001 233 0.000 279 0.282 257 0.001 565 -9.5 1.41 1.80 -0.96 07
      HCY-1-06 1 866 0.020 266 0.005 380 0.000 737 0.000 058 0.281 464 0.000 684 -5.6 2.48 2.73 -0.98 08
      HCY-1-07 430 0.022 072 0.005 694 0.000 783 0.000 061 0.282 409 0.000 666 -3.5 1.18 1.50 -0.98 09
      HCY-1-08 2 206 0.039 387 0.009 895 0.001 450 0.000 107 0.281 481 0.000 647 1.6 2.51 2.62 -0.96 10
      HCY-1-09 431 0.059 845 0.039 277 0.002 289 0.000 439 0.282 315 0.001 689 -7.3 1.37 1.70 -0.93 11
      HCY-1-10 2 085 0.026 398 0.005 955 0.000 995 0.000 073 0.281 525 0.000 573 1.1 2.42 2.55 -0.97 12
      HCY-1-11 2 013 0.045 132 0.009 953 0.001 688 0.000 127 0.281 673 0.000 556 3.8 2.25 2.34 -0.95 13
      HCY-1-12 2 181 0.019 089 0.004 057 0.000 572 0.000 044 0.281 580 0.000 539 5.8 2.32 2.37 -0.98 14
      HCY-1-13 2 087 0.040 641 0.008 372 0.001 017 0.000 073 0.281 662 0.000 521 6.0 2.23 2.28 -0.97 15
      HCY-1-14 429 0.061 085 0.012 146 0.002 175 0.000 152 0.282 374 0.000 504 -5.3 1.28 1.58 -0.93 16
      HCY-1-15 430 0.128 690 0.068 608 0.004 886 0.000 764 0.282 391 0.001 371 -5.4 1.36 1.59 -0.85 17
      HCY-1-16 2 135 0.036 717 0.006 975 0.001 086 0.000 061 0.281 635 0.000 486 6.0 2.27 2.32 -0.97 18
      HCY-1-17 430 0.023 183 0.012 404 0.001 473 0.000 127 0.282 433 0.001 468 -3.2 1.18 1.48 -0.99 19
      HCY-1-18 431 0.022 493 0.012 321 0.000 840 0.000 138 0.282 428 0.001 406 -2.9 1.16 1.45 -0.97 20
      HCY-1-19 2 150 0.028 354 0.005 028 0.000 958 0.000 055 0.281 637 0.000 450 6.6 2.26 2.30 -0.97 21
      下载: 导出CSV

      表  3  泰宁地区何宝山辉绿岩脉主量元素(%)分析结果

      Table  3.   Major elements contents (%) for the Hebaoshan diabase dike

      样号 SiO2 TiO2 Al2O3 TFe2O3 MnO MgO CaO Na2O K2O P2O5 LOI Total SiO2 TiO2 Al2O3 TFe2O3 MnO MgO CaO Na2O K2O P2O5 Total
      原始值 校正值
      HCY-1 46.11 1.26 16.48 10.40 0.31 5.50 8.14 3.35 1.80 0.25 6.60 100.20 49.26 1.35 17.61 11.11 0.33 5.88 8.70 3.58 1.92 0.27 100.00
      HCY-2 47.25 1.28 17.30 10.32 0.29 4.99 7.45 3.71 2.03 0.30 5.67 100.59 49.78 1.35 18.23 10.87 0.31 5.26 7.85 3.91 2.14 0.32 100.00
      HCY-3 48.70 1.34 17.34 10.27 0.30 4.69 4.63 3.95 2.27 0.29 5.75 99.53 51.93 1.43 18.49 10.95 0.32 5.00 4.94 4.21 2.42 0.31 100.00
      HCY-5 43.59 1.17 14.58 10.72 0.27 9.79 9.75 2.61 1.54 0.21 5.74 97.97 46.26 1.24 15.47 11.38 0.29 10.39 10.35 2.77 1.63 0.22 100.00
      HCY-6 44.79 1.12 14.70 10.05 0.29 9.73 11.30 2.72 1.62 0.23 5.17 99.72 46.39 1.16 15.23 10.41 0.30 10.08 11.70 2.82 1.68 0.24 100.00
      HCY-7 45.37 1.26 16.74 10.48 0.47 5.12 7.97 3.33 1.99 0.25 8.46 101.44 48.80 1.36 18.00 11.27 0.51 5.51 8.57 3.58 2.14 0.27 100.00
      HCY-8 45.76 1.26 16.83 10.76 0.47 5.30 7.78 3.33 1.97 0.26 8.51 102.23 48.83 1.34 17.96 11.48 0.50 5.66 8.30 3.55 2.10 0.28 100.00
      下载: 导出CSV

      表  4  泰宁地区何宝山辉绿岩脉微量元素(10-6)、稀土元素(10-6)和Sr-Nd同位素分析结果

      Table  4.   Trace elements (10-6) and rare earth elements (10-6) and Sr-Nd isotopic compositions for the Hebaoshan diabase dike

      样号 HCY-1 HCY-2 HCY-3 HCY-5 HCY-6 HCY-7 HCY-8
      Sc 25.90 23.20 21.20 27.90 27.30 27.80 26.70
      V 239.00 239.00 251.00 256.00 232.00 246.00 239.00
      Cr 87.60 45.90 16.60 556.00 605.00 89.10 79.30
      Co 35.50 40.00 29.00 50.30 64.70 34.70 34.60
      Ni 36.96 32.86 18.80 182.71 185.54 36.52 36.32
      Ga 15.90 16.20 14.80 13.40 13.50 15.60 16.00
      Rb 53.80 61.10 76.60 9.89 11.00 68.40 62.00
      Sr 533.00 594.00 624.00 442.00 434.00 633.00 607.00
      Y 17.20 20.70 17.10 13.10 16.60 16.80 18.40
      Zr 66.50 85.70 75.10 57.30 61.00 68.00 74.70
      Nb 6.08 8.45 7.40 5.74 6.00 6.60 7.06
      Ba 390.00 506.00 526.00 193.00 196.00 734.00 736.00
      La 11.20 13.90 11.40 7.71 9.15 10.90 12.30
      Ce 22.90 29.40 24.30 16.80 20.10 22.80 24.80
      Pr 2.75 3.56 2.98 2.11 2.47 2.79 3.03
      Nd 12.40 15.70 13.10 9.59 11.50 12.50 12.90
      Sm 2.66 3.27 2.93 2.08 2.63 2.83 3.22
      Eu 0.96 1.16 0.93 0.78 0.92 0.99 1.03
      Gd 2.92 3.65 2.96 2.28 2.93 3.13 3.30
      Tb 0.45 0.55 0.43 0.36 0.43 0.47 0.51
      Dy 2.78 3.36 2.76 2.15 2.71 2.85 2.93
      Ho 0.58 0.67 0.58 0.46 0.56 0.60 0.62
      Er 1.55 1.86 1.62 1.21 1.59 1.59 1.71
      Tm 0.21 0.26 0.25 0.17 0.21 0.24 0.23
      Yb 1.37 1.68 1.46 1.11 1.30 1.47 1.52
      Lu 0.20 0.25 0.22 0.16 0.21 0.22 0.22
      Hf 1.53 1.93 1.69 1.29 1.32 1.69 1.69
      Ta 0.33 0.49 0.39 0.28 0.37 0.34 0.41
      Pb 6.15 5.32 5.47 2.25 2.60 11.49 8.68
      Th 1.02 1.40 1.21 0.70 0.78 1.04 1.10
      U 0.22 0.32 0.27 0.17 0.20 0.25 0.28
      87Rb/86Sr 0.292 038 0.297 616 0.355 199 - - 0.312 649 0.295 556
      147Sm/144Nd 0.129 682 0.145 165 0.135 212 - - 0.136 867 0.150 899
      87Sr/86Sr 0.709 48 0.709 63 0.710 87 - - 0.710 07 0.710 74
      2σ 0.000 006 0.000 005 0.000 007 - - 0.000 008 0.000 008
      143Nd/144Nd 0.512 446 0.512 460 0.512 454 - - 0.512 465 0.512 468
      2σ 0.000 008 0.000 007 0.000 008 - - 0.000 009 0.000 006
      87Sr/86Sr(t) 0.707 691 0.708 087 0.708 695 - - 0.708 155 0.708 930
      εNd(t) -0.1 -0.7 -0.2 - - -0.1 -0.8
      T1DM(Nd) 1.21 1.20 1.21 - - 1.36 1.44
      T2DM(Nd) 1.15 1.14 1.15 - - 1.18 1.19
      注:εNd(t)值计算采用(147Sm/144Nd)CHUR=0.196 7,(143Nd/144Nd)CHUR=0.512 (DePaolo and Wasserburg, 1979);t代表成岩年龄(430 Ma).
      下载: 导出CSV
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